If anyone has not visited Op's flicker page, may I suggest you do. I just added him as a contact. His work is truly stunning and his night shots long exposures are in a class of their own.
really inspiring.

Takes 400 pics at 1/6-adjusting camera position every 20.
Later stack pictures using some software
Tracking is not needed for wide angle, short exposure shots such as this which is gorgeous. Quick question for the OP: DId you set up your tripod for the twilight shot and then leave it as-is for the night shot? Or was the Milky Way shot a separate composure? Also 14-24 lens at 14mm? TIA, Dave